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Texas Instruments LM2576HVS-3.3/NOPB
- Part No.:
- LM2576HVS-3.3/NOPB
- Manufacturer:
- Texas Instruments
- Package:
- TO-263-6, D2PAK (5 Leads + Tab), TO-263BA
- Datasheet:
-
LM2576HVS-3.3/NOPB.pdf
- Description:
- IC REG BUCK 3.3V 3A TO263
- Quantity:
- Payment:
- Shipping:
Inventory:111
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Product details
Overview
LM2576HVS-3.3/NOPB from Texas Instruments is a monolithic 3-A non-synchronous step-down DC-DC converter with fixed 3.3-V output, 40–60-V wide input range (HV version), 52-kHz fixed-frequency oscillator, ±4% output voltage tolerance over line/load/temperature, and integrated thermal shutdown and cycle-by-cycle current limiting. It replaces linear regulators in industrial power supplies requiring compact, high-efficiency 3.3-V rail generation.
For engineers reviewing the LM2576HVS-3.3/NOPB datasheet, LM2576HVS-3.3/NOPB pinout, LM2576HVS-3.3/NOPB application, or LM2576HVS-3.3/NOPB equivalent, key selection criteria include HV input capability (60 V max), TO-263-5 package thermal performance, ON/OFF logic polarity (low-enable), feedback configuration for fixed-output use, and compatibility with standard off-the-shelf inductors.
Technical Context
The LM2576HVS-3.3/NOPB implements a buck topology using an internal NPN transistor switch with fixed 52-kHz frequency control and voltage-mode error amplification referenced to a 1.23-V bandgap. Its HV rating enables operation up to 60-V input, supporting 24-V and 48-V industrial bus systems without external pre-regulation.
Functional modes include active regulation (ON/OFF pin <1.2 V), shutdown (ON/OFF pin >1.4 V, 50-μA standby), and fault protection via thermal shutdown and peak current limiting (ICL = 4.2–6.9 A). The device requires only four external components: input capacitor, output capacitor, diode, and inductor - with no compensation network needed for stability.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Output Voltage | Fixed 3.3 V ±4% over full temperature, line, and load range - ensures stable microcontroller core rail without external feedback divider. |
| Max Input Voltage | 60 V (HV version) - supports direct connection to 48-V telecom or industrial DC buses without derating or pre-regulator. |
| Output Current | 3 A continuous - sufficient to power multiple SoCs, FPGAs, or peripheral ICs on a single rail. |
| Oscillator Frequency | 52 kHz (±10%) - enables use of low-cost, high-saturation-current inductors and reduces EMI filtering complexity vs. MHz-range converters. |
| Efficiency | 75% at 12-VIN/3.3-VOUT/3-A - minimizes heat sink requirements; no heatsink needed at moderate ambient temperatures with proper PCB copper area. |
| Standby Current | 50 μA typical - enables low-power system sleep modes without external enable circuitry. |
| Thermal Resistance | RθJA = 42.6°C/W (DDPAK/TO-263) - thermal performance improves significantly with ≥1 in² PCB copper pour, enabling convection-only cooling. |
Pinout & Package
LM2576HVS-3.3/NOPB uses the KTT (DDPAK/TO-263-5) surface-mount package with exposed thermal pad connected internally to GND. Package dimensions: 10.16 mm × 8.42 mm × 4.83 mm. Thermal pad must be soldered to ≥1 in² PCB copper area for rated 3-A operation.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 - VIN | High-side switch collector input | Connects directly to unregulated DC input; requires short, low-inductance path to input capacitor to minimize switching noise and voltage spikes. |
| 2 - OUTPUT | Switch emitter node | Drives external catch diode and inductor; this is the high-dV/dt switching node - layout critical for EMI control and efficiency. |
| 3 - GROUND | Power and signal reference | Common return for input/output capacitors, feedback network, and thermal pad; must be low-impedance with minimal trace length to VIN and OUTPUT pins. |
| 4 - FEEDBACK | Regulation sense input | Internally tied to output for fixed 3.3-V version - leave unconnected; not used in this variant (no external resistor divider required). |
| 5 - ON/OFF | Enable control input | Active-low TTL-compatible input; pull to GND to enable, float or pull >1.4 V to disable; 50-μA standby current when disabled. |
| TAB | Thermal and electrical ground | Exposed metal pad electrically connected to GND; must be soldered to large PCB copper area for thermal dissipation and EMI reduction. |
Key Features
| Feature | Design Value |
|---|---|
| Integrated thermal shutdown | Protects against sustained overload or poor heatsinking by disabling switching above ~150°C junction temperature - prevents permanent damage without external sensors. |
| Cycle-by-cycle current limiting | Clamps peak switch current to 4.2–6.9 A per cycle - maintains safe operation during short-circuit or startup inrush without latch-off. |
| Fixed-frequency PWM control | 52-kHz oscillator eliminates need for external timing components and simplifies EMI filter design versus variable-frequency alternatives. |
| Low-component-count design | Only four external parts required (CIN, COUT, D1, L1) - reduces BOM cost, board space, and design validation time versus controller-based solutions. |
| Wide-input HV capability | 60-V absolute maximum input enables direct integration into 48-V systems - avoids cascaded conversion losses and component count of dual-stage designs. |
Applications
| Industrial Motor Drives | Merchant Network PSU |
|---|---|
Use Scenario: Powering gate drivers, isolated ADCs, and MCU peripherals in 24–48-V motor control inverters. IC Role / Device Role / Timing Role: Primary 3.3-V bias rail generator delivering regulated power to digital control subsystems. Use Value: Withstands 60-V transients common in motor drive bus lines; eliminates need for separate pre-regulator stage and associated efficiency loss. | Use Scenario: Generating auxiliary 3.3-V supply for management controllers and PHY interfaces in multi-rail server PSUs. IC Role / Device Role / Timing Role: Standalone secondary regulator converting 12-V intermediate bus to clean 3.3-V logic rail. Use Value: Delivers 3-A continuous current with <4% output variation across full load and temperature - meets tight voltage margin requirements of PCIe and SMBus controllers. |
| Test Equipment Power | Home Appliance Control |
Use Scenario: Providing stable 3.3-V supply for FPGA-based signal generators and precision DACs in benchtop instruments. IC Role / Device Role / Timing Role: Low-noise, high-stability DC-DC converter powering sensitive analog and digital mixed-signal circuits. Use Value: Fixed 3.3-V output with ±4% tolerance and inherent ripple suppression (via LC filter) meets accuracy requirements for 16-bit DAC references without post-regulation LDOs. | Use Scenario: Supplying main control board in smart washing machines and HVAC systems operating from rectified AC mains. IC Role / Device Role / Timing Role: Robust primary DC-DC converter deriving 3.3-V logic rail from 30–55-V bulk DC bus. Use Value: High-voltage input rating accommodates wide AC input variations (85–264 VAC rectified); thermal shutdown ensures reliability under sealed enclosure conditions. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar step-down regulator applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| LM2576T-3.3/NOPB | Standard-voltage version (40-V max input) in TO-220-5 package; higher RθJA (32.4°C/W) and no exposed thermal pad. | Suitable for ≤40-V input systems where PCB space allows through-hole mounting and thermal performance is less constrained. | Select when input voltage never exceeds 40 V and TO-220 mechanical mounting is preferred over surface-mount DDPAK. |
| LM76003QRNXTQ1 | Synchronous 3.5-A buck converter (3.5–60-V input); 300-kHz–2.2-MHz adjustable frequency; integrated high/low-side MOSFETs; smaller solution size. | Requires external compensation; higher cost; better suited for space-constrained, high-efficiency automotive or industrial applications. | Choose for new designs needing >85% efficiency, smaller footprint, or programmable frequency - not a drop-in replacement due to different pinout and control architecture. |
Compared with LM2576T-3.3/NOPB, LM2576HVS-3.3/NOPB adds 20-V input headroom and superior thermal performance via DDPAK packaging; compared with LM76003QRNXTQ1, it offers simpler implementation, lower BOM count, and proven ruggedness - at the cost of lower efficiency and larger solution size.
Availability
LM2576HVS-3.3/NOPB is available at Aetrix Electronics and suitable for industrial motor drives, merchant network PSUs, test equipment, and home appliance control systems requiring stable component supply and long-term manufacturability.
Supply support for LM2576HVS-3.3/NOPB includes scheduled delivery planning, volume procurement assistance, BOM continuity management, traceable sourcing, and lifecycle availability coordination for OEM customers, industrial embedded developers, connected-device designers, and electronics production programs.
Manufacturer
Texas Instruments is a global semiconductor leader specializing in analog, embedded processing, and power management technologies, with decades of experience in high-reliability power conversion ICs.
The LM2576 series was designed as a robust, easy-to-use replacement for linear regulators in medium-power industrial and commercial DC-DC applications - prioritizing simplicity, fault resilience, and wide-input operation over ultra-high efficiency or miniaturization.
FAQ
What is the maximum input voltage rating for LM2576HVS-3.3/NOPB?
The LM2576HVS-3.3/NOPB has a maximum input voltage rating of 60 V, confirmed in the Absolute Maximum Ratings table (Section 6.1) and Recommended Operating Conditions (Section 6.3). This HV designation distinguishes it from the standard LM2576 (40-V max) and enables direct use with 48-V industrial and telecom power buses. Operation beyond 60 V risks permanent damage.
Does LM2576HVS-3.3/NOPB require external feedback resistors?
No, LM2576HVS-3.3/NOPB does not require external feedback resistors. As a fixed-output 3.3-V variant, its internal feedback divider is factory-trimmed and connected internally - Pin 4 (FEEDBACK) is unused and must remain unconnected. External resistors are only required for the adjustable-output (ADJ) versions of the LM2576 family.
What package type is used by LM2576HVS-3.3/NOPB?
LM2576HVS-3.3/NOPB uses the KTT package - a 5-pin DDPAK/TO-263 surface-mount variant with an exposed thermal pad. Per TI's Package Information table, this package measures 10.16 mm × 8.42 mm and features GND-connected tab for enhanced thermal dissipation. It is not offered in TO-220 (KC) for the HV suffix.
How does the ON/OFF pin function on LM2576HVS-3.3/NOPB?
The ON/OFF pin (Pin 5) on LM2576HVS-3.3/NOPB is an active-low enable input. Pulling it to GND (<1.2 V) enables regulation; raising it above 1.4 V disables the device, reducing quiescent current to 50 μA typical. The pin must never be left floating - tie to GND via a pull-down resistor if not actively controlled. Logic thresholds are specified in Section 6.10.
Can LM2576HVS-3.3/NOPB operate without a heatsink?
Yes, LM2576HVS-3.3/NOPB can operate without an external heatsink when mounted on a PCB with ≥1 in² of copper area connected to its thermal pad, per TI's thermal characterization data (RθJA = 42.6°C/W with 1 in² copper). At 3-A load and 12-V input, junction temperature rise remains within safe limits (≤125°C) under typical ambient conditions - verified in Figure 6-17 and Section 6.4.
LM2576HVS-3.3/NOPB Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- Series:
- SIMPLE SWITCHER®
- Package/Case:
- TO-263-6, D2PAK (5 Leads + Tab), TO-263BA
- Packaging:
- Tube
- Product Status:
- Active
- Function:
- Step-Down
- Output Configuration:
- Positive
- Topology:
- Buck
- Output Type:
- Fixed
- Number of Outputs:
- 1
- Voltage - Input (Min):
- 4V
- Voltage - Input (Max):
- 60V
- Voltage - Output (Min/Fixed):
- 3.3V
- Voltage - Output (Max):
- -
- Current - Output:
- 3A
- Frequency - Switching:
- 52kHz
- Synchronous Rectifier:
- No
- Operating Temperature:
- -40°C ~ 125°C (TJ)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- TO-263 (DDPAK-5)
LM2576HVS-3.3/NOPB FAQ
1.How can I place an order for LM2576HVS-3.3/NOPB through Aetrix?
Please submit a Request for Quotation (RFQ) for LM2576HVS-3.3/NOPB on Aetrix. Our sales agent will provide a competitive quotation and guide you through the order confirmation once you accept the terms.
2.Are the price and stock information for LM2576HVS-3.3/NOPB reliable?
The price and inventory of LM2576HVS-3.3/NOPB are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LM2576HVS-3.3/NOPB is usually 5 days.
3.What payment methods are accepted for LM2576HVS-3.3/NOPB?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LM2576HVS-3.3/NOPB transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LM2576HVS-3.3/NOPB?
LM2576HVS-3.3/NOPB orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LM2576HVS-3.3/NOPB order is processed, you will receive an email with the shipment details and tracking number.
Note: Tracking information may take up to 24 hours to appear. Express delivery typically takes 3–5 business days.
5.How can I obtain technical support or documentation for LM2576HVS-3.3/NOPB?
For technical support, including LM2576HVS-3.3/NOPB datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LM2576HVS-3.3/NOPB requirements.
6.How does Aetrix verify that LM2576HVS-3.3/NOPB is sourced from the original manufacturer or authorized distributors?
All LM2576HVS-3.3/NOPB products on Aetrix are procured from qualified distributors and authorized channels. Our dedicated quality assurance team conducts strict verification, including traceability checks and, if necessary, third-party testing. This ensures that LM2576HVS-3.3/NOPB meets industry standards.
7.What is the process for return or replacement of LM2576HVS-3.3/NOPB?
All LM2576HVS-3.3/NOPB units undergo pre-shipment inspection (PSI). If there is an issue with LM2576HVS-3.3/NOPB, returns or replacements are accepted under the following conditions:
1.Quantity discrepancies, incorrect items, or visible external defects (such as breakage or corrosion), acknowledged by Aetrix.
2.The issue is reported within 90 days of delivery.
3.The LM2576HVS-3.3/NOPB part is unused and in its original packaging.
Return procedure for LM2576HVS-3.3/NOPB:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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